Igor Pak

{{Infobox scientist

| birth_name =

| birth_date = {{birth year and age|1971}}

| birth_place = Moscow, Soviet Union

| death_date =

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| fields =

| workplaces = Yale University
Massachusetts Institute of Technology
University of Minnesota
University of California, Los Angeles

| education = Moscow State School 57

| alma_mater = Moscow State University (BS)
Harvard University (PhD)

| thesis_title = Random Walks on Groups: Strong Uniform Time Approach

| thesis_url = https://www.proquest.com/openview/3a800d77b0363d3daaab4e9b1107cdf2

| thesis_year = 1997

| doctoral_advisor = Persi Diaconis

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| known_for = Combinatorics

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}}

Igor Pak ({{langx|ru|link=no|Игорь Пак}}) (born 1971, Moscow, Soviet Union) is a professor of mathematics at the University of California, Los Angeles, working in combinatorics and discrete probability. He formerly taught at the Massachusetts Institute of Technology and the University of Minnesota, and he is best known for his bijective proof of the hook-length formula for the number of Young tableaux, and his work on random walks. He was a keynote speaker alongside George Andrews and Doron Zeilberger at the 2006 Harvey Mudd College Mathematics Conference on Enumerative Combinatorics.

Pak is an Associate Editor for the journal Discrete Mathematics.[http://www.elsevier.com/wps/find/journaleditorialboard.cws_home/505610/editorialboard Editorial Board], Discrete Mathematics, Elsevier. Accessed February 10, 2010 He gave a Fejes Tóth Lecture at the University of Calgary in February 2009.[http://ccdg.math.ucalgary.ca/news-events/events/fejes-toth-lectures/inflating-polyhedral-surfaces Fejes Tóth Lecture] {{webarchive|url=https://archive.today/20130102022625/http://ccdg.math.ucalgary.ca/news-events/events/fejes-toth-lectures/inflating-polyhedral-surfaces |date=2013-01-02 }}, Centre for Computational and Discrete Geometry, University of Calgary. Accessed February 10, 2010

In 2018, he was an invited speaker at the International Congress of Mathematicians in Rio de Janeiro.